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Jason Antin, a native of Massachusetts who now calls Colorado home, focuses all of his time on striving to achieve the ultimate work-life balance. He started playing outdoors in the White Mountains of New England at a young age. After graduating from St. Lawrence University he began his guiding career working with adults with developmental disabilities in Boston. His love for teaching mountain craft and sharing the outdoors with others inspired a move to the Rocky Mountains of Colorado where he has been working as a guide for over a decade.

Jason is highly trained in risk management and wilderness emergency medicine and is an incredibly competent guide in all areas of mountain exploration. His greatest passion in the outdoors is embarking on endurance-based alpine adventures. Overall, Jason’s goal in guiding is to provide a safe and positive experience that his guests will talk about for years to come!

Some of Jason’s most memorable mountain exploits include summiting Denali twice in a week, once via the Cassin Ridge.  Climbing the Nose In A Day during his first time on El Cap, or combining endurance & alpine skills to create incredible adventures like the “Orizaba Rodeo” or to set a speed record on the Rainier Infinity Loop.

Along with guiding, Jason coaches at the Alpine Training Center Gym in Boulder, CO where he prepares his athletes for the physical and mental rigors of the mountains.  He also continues to work on his Beat Monday project (featured on Outside TV), where Jason utilizes years of mountain experience and looks for creative and challenging ways to squeeze the most adventure out of your standard 2-day weekend.

Off the clock, Jason shares his home in Golden, CO with his wife Jenny and his two daughters Avery and Andora. He enjoys moving quickly in the mountains over all mediums that mother nature shares with us whether that be trails, rock, ice or snow.


“If I Could Give More Stars, I Would!”

If I could give more stars, I would! The office staff at CMS is excellent: eager to help folks complete successful adventures. My mountain climbing experience with Jason was absolutely outstanding. He’s an expert, a pro, in every possible way without a hint of condescension. Patient, skilled, directive, supportive… the list goes on. I am literally already thinking about new adventures to take on, JUST so I can work with him again. (Ice climbing, anyone?) I cannot recommend him or this organization highly enough. Don’t hesitate. Figure out your next “big thing” and ask CMS to help you make it happen. They’re worth EVERY penny.

- Melissa Tatro

“Had My Mind Blown”

I had a fantastic day out with Jason Antin for the big wall clinic. I’ve never done anything with a guide before and had my mind blown! His attention to detail, coaching, knowledge base, encouragement, and general stoke level were top notch. I learned a ton and am feeling confident and ready to tackle big stuff. Thanks Jason and CMS!

- Jake Lucas

“Couldn’t Have Asked for a Better Experience”

CMS and the team have been awesome. I went on my first ever guided climb with Jason Antin and couldn’t have asked for a better experience. Jason focused on my specific climbing goals throughout the day, had a ton of knowledge of other climbs in the area and ways I could improve, and made sure we were 100% safe throughout the climb (and also made the experience really enjoyable and positive!). I’ll most definitely be back to climb more with CMS and Jason!

- Krisy Mlynczak

“Upbeat, Fun, and Extremely Capable”

Jason Antin was our guide on the flatirons and did an AMAZING job. Jason was very upbeat, fun, and extremely capable. It allowed our team to focus on the experience and the challenge instead of the uncertainty of the logistics and the concern that we weren’t properly planned. Would absolutely work with CMS and Jason again…

- Chris Porter

“Jason was Friendly, Knowledgeable”

If you are considering big climbing objectives, getting back into it after a lay off, or new to it all—you need this class. No two emergencies are the same but through this class you will learn a systematic approach to address them all. Our instructor Jason was friendly, knowledgeable and has the resume to back up his instruction. Save yourself and your partner the epic and take this class.

- James Barnum

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